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QR Codes

qrcode They're those square barcode things that you can scan with your phone. They can encode up to 250 characters of text as well as urls. This one contains some text but it also has an html link to a website that creates them, which is pretty neat.

I'm now getting the hang of smartphones having downloaded apps that monitor my 3G data usage, show me the night sky in the direction I'm looking, scan barcodes (and finds them on Google Books) and, natch, rolls dice.